Grinding machine



Dec. 8, 1931. v, E FLODlN 1,835,291

GRINDING MACHINE Original Filed April .9, 1928 2 Sheets-Sheet 1 Dec. 8, 1931. I v FLODlN 1,835,291

GRINDING MACHINE Original Filed April 9, 1928 2 Sheets-Sheet 2 I ,1 .jwerdor W766 rlTjzmr Patented Dec. 8, 1931 UNITED STATES- PATENT OFFICE:

VICTOR FLO-DIN, OF OAK PARK, ILLINOIS, ASSIG'IVOR TO CRANE 00., OF CHICAGO, ILLI- NOIS, A CORPORATION OF ILLINOIS Y GRINDING MACHINE Applicatonfiled April 9, 1928, Serial No. 268,486. Renewed October 19,1931.

facture of an improved gate valve and is also peculiarly adaptable for use in carrying out the method of said r-opending application.

As it is necessary to use extreme accuracy in carrying out the method of my aforesaid ip copending application for the production of the article thereof and to such end such method was devised, so also it is necessary that the valve gates themselves be carefully and accurately prepared, a proper regard particularly being had to the finishing of the seating surfaces of the gate so that both will seat simultaneously on the valve seats or seat rings in the body and have complete and uniform contact therewith circumferentially thereof. j

One of the principal objects of the invention is to provide a jig or fixture primarily designed to grind or otherwise surface the gate seat surfaces in predetermined angular relationship to one another and so that the planes of such surfaceswill lie in predetermined angular relationship to a plane containing the axis of movement of the gate at the end of'its closingand/or the beginning of its opening movement and containing the line of intersection of the planes of the seat surfaces of the gates if the gate is ofthe wedge type or occ-u i-iying a'position contain:

ingthe axis of movement of the gate at the 40 end of its closing and the beginning of its opening movement and lying intermediate of the planes of the seat surfaces. In the em bodiment illustrated. the gate is provided with. finished guides on opposite sides, the

or substantially so' and theguides beinglso arranged that the valve over the end of its cEsing and the beginning of its opening movements will move in a straight line, the seating surfaces being so arranged that their longitudinal axes of the guides being parallelplanes will intersect at the bottom of the gate and so that their line of'intersection will lie in a plane containing the longitudinal one that'will be easily transportable from place to place and adap'table for use inconnection with the various types of mechanism wh chmay'be used to effect the surfacing of articles held thereby and onethat will secureosition. v V

Many further objects as well'as advan tages, uses and functions of this device will be 'or should become readily appreciated after a perusal of' the following description and claims and after viewing the drawings in which 7 n v Fig. 1 is a top plan view of a embodiment of my invention,

Fig. 2 is an elevational view'of one side thereof, and

Fig. 3 is a verticalsectional view taken along the axes of the trunnions of the article holder. j t

The device illustrated is designed to hold and secure an article such as a valve gate preferred thereof and which is to have itsopposite seat faces 4 and 5 grounder otherwise-finished ly and fixedly holdits articlesin the desired to lie in planes which intersect in a straight line lyingin a plane bisecting the angleof intersection and containing lines of mean center of curvature or, as I shall term them,

the longitudinal axes of the ribs 3. Aswill he noted, the surfaces 6 of the ribs 3 are, in cross section, struck on short radii'of the same length from corresponding center points in order that the guiding surfaces of the ribs will be practically identical throughout their length and curved width. The

truing or grinding or finishing of thesuri faces I and 5 is therefore accomplished with reference to the guide ribs 3 and gauged from their surfaces 6.

The'jig or fixture in which the valve gates are held comprises a base 7 adapted to be clamped by the engagement of bolts through slots 8 to the top 9 of a rotary support 10 mounted in one or more suitable thrust bearings such as that shown at 11 and driven by a pulley or the like 12. It should be understood, however, that the support need not rotate if the surfacing tool, which in this instance is shown as a rotary grinding wheel 13, is designed or arranged to move about the surface to be finished.

The base 7 at two diagonally opposite corners is provided with trunnion supports 14 in axial alignment and in the tops of these supports journal bushings 15 are placed. Bearing caps 16 for removal and replacement of the journal bushings are preferably provided. T runnion pivots17 are secured to the yoke by pins 20 and are mounted in the journals to carry a valve gate or disc holder frame therebetween comprising in general a yoke 18 and a bracing bar or rod 19 rigidly secured thereto.

The yoke arms 21 and 22 are each slotted longitudinally, the arm 21 to receive an adjustable clamp member 23 having a nice lit therein and the arm 22 to receive a non-adjustable clamp member 24 with a nice fit therein also. Each clamp member has a slot of V-shape 25 in its inner longitudinal face for reception of the guide ribs 3 and while the clamp member 24 is permanently secured in the arm 22 by two or more screws 26 the guide member 23 is loosely pinned to the arm 21 by a pin 27 which passes through a long1- tudinal slot 28 in the guide so that it may be adjusted toward and from the guide 24. Movement of the guide 23 toward the guide 24 is accomplished by turning set or adjust ment screws 29 which pass through the arm 21 and engage against a metal insert 30 pinned in a slot along the back of the guide 23 by means of a pin 31. The metal insert, of course, prevents the guide jaws from biting into the guide rib on the valve gate if too much pressure is applied by the screws 29 since the movement of the metal insert is limited. It will. thus be apparent that when the article, in this case the gate 2, is placed between the jaws of the clamp members the clamp 23 is tightened up to cause the article to be tightly clamped by and between the clamp members.

The valve gate shown is provided with lugs 32 which are undercutto provide a recess into which the valve stem head is adapted to be fitted and for the purpose of adjusting the gate longitudinally of the guides 23 and 24 an adjustment screw threadedly engaged with the yoke as at 34 has a head 35 W1 ich engages the bottom of the recess 33 and limits its position. Suitable recesses 36 formed in the screw enable it to be engaged by a tit wrench and lock nut 37 holds it in adjusted position.

In order to prevent lateral movement of the yoke and the gate during the grinding or surfacing, thrust collars 38 are provided on the trunnion pivot 17 and in order that each seat surface on the gate or disc may be ground or otherwise surfaced in proper relation to the other the yoke is provided with what I shall term an abutment head 39, the opposite surfaces 40 and 41 of which are parallel and equi-distant from a plane bisecting the longitudinal grooves 25 in the guides. These abutment head surfaces 40 and 41 are adapted to contact respectively with abutment surfaces 42 and 43 at the same height and inclination on plates 51 mounted on abutments or abutment lugs 44 and 45 cast integral with or otherwise formed at diagonally opposite corners of the base 7 with their centers on a line perpendicular to the axes of the trunnions 17.

Each of the abutment lugs 44 and 45 is recessed as shown at 46 for the reception of the eye of an eye bolt 47 which is pivotally mounted on a transverse pivot 48. Springs 49 each connected at one end to the base 7 and at its other end to a pin 50 secured to the adjacent eye bolt, serve to hold the bolts in a more or less upright position against portions of the plates 51 on the lugs 44 and 45 for convenience. The shanks of the bolts 47 are arranged alternately to engage in a slot 52 formed in the head 39 of the article holder yoke and secure the yoke head tightly against the corresponding abutment surface 42 and. 43. lVith the arrangement as thus described, when one side of the gate has been surfaced, the yoke, with the article in position, is swung over and secured to the opposite abutment on the base so that the opposite gate surface may be surfaced in a predetermined relation to the first finished surface. 7

Various modifications and embodiments of the invention will. be apparent or may be devised and for such reason I desire to be limited only by the spirit of the invention and the scope of the appended claims.

I claim:

1. In a grinding machine the combination of a surface finishing tool, adapted to operate over a plurality of points in one plane, with means for supporting an article having opposite surfaces to be finished in predetermined relation to one another, in operative relation to said tool comprising, means for holding and positioning the article with one of said surfaces in predetermined relation to said tool. and means for moving and positionin g said holding means to position the opposite surface of the article in predetermined relation to said tool and the first finished surface.

2. A device of the character described comprising, a base, a pair of spaced abutments on said base, an article securing and supporting member pivotally mounted on an axis transverse to a line through said abutpivot axis of said holding means'and adapted I i ments whereby said member may be swung toward either of said abutments, said member having a portion adapted to contact with either of said abutments when the member is swung theretoward and means for securing said member in position when in contact with said abutments.

3. A device of the character described comprising, a base, a pair of spaced abutments on said base, an article securing and supporting member pivotally mounted on an axis median of and transverse to a line through said abutments whereby said member may be swung toward either of said abutments, said member having a portion adapt ed to contact with either of said abutments when the member is swung theretoward, and means for securing said member to either of said abutments.

4. A device of the character described com- 7 prising, a base, article holding means pivotally secured to said base, aligned abutments secured to said base on opposite sides of the to limit swinging movements of said holding means about its pivot beyond predetermined alternative positions, and means for securing an article to said holding means in predetermined position.

5. A device of the character described comprising, a base, article holding means pivotally secured to said base, aligned abutments secured to said base on opposite sides of the pivot axis of said holding means and adapted to limit swinging movements of said holding means about its pivot beyond predetermined alternative positions, and means for securing said holding means against either abutment.

6. A device of the character described comprising, a base, a frame trunnioned on said base, a stop on said frame, a stop on said base on each side of the trunnion axis of said frame and cooperative with the stop on said frame for limiting movements of the latter beyond predetermined positions, and clamp members relatively movable toward and from one another carried by said frame for securing an article thereto for movements therewith.

7 A device of the character described comprising, a base, a frame trunnioned on said 7 base, a stop on said frame, a. stop on said base on eachside of the trunnion axis of said frame and cooperative with the stop on said frame for limiting movements of the latter beyond predetermined positions, means carried by said frame for securing an article thereto for movements therewith, and means for securing the stop on the frame against either of the stops on said base.

In witness of the foregoing I afl'ix my signature.

VICTOR E'. FLODIN. 

